CN213965293U

CN213965293U - Circular flow clarifier system for water outlet on U-shaped pipe pool surface

Info

Publication number: CN213965293U
Application number: CN202022478585.1U
Authority: CN
Inventors: 陈福明; 刘淑杰; 刘旭
Original assignee: Qingyan Environmental Technology Co Ltd
Current assignee: Qingyan Environmental Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-08-17
Anticipated expiration: 2030-10-30

Abstract

The application discloses circulation clarifier system of U-shaped pipe pond face play water includes: the loop clarifier comprises a loop cavity and an overflow groove arranged at the top of the loop cavity; a U-tube assembly comprising a U-tube having two communicating tube orifices, both of said orifices communicating with an overflow trough; and the water flow control assembly comprises a water flow control part and a water conduit communicated with the water flow control part and one of the nozzles. According to the circulation clarifier, the U-shaped pipe assembly is arranged below the overflow groove, and the water flow control assembly is connected through the U-shaped pipe assembly, so that the existing circulation clarifier is conveniently transformed, and subsequent use and maintenance are facilitated. This application can use the water pump to carry out the drainage, can utilize the siphon principle to carry out unpowered drainage more optimally, also can go out the basin with water pump and siphon and combine together, carries out preliminary troubleshooting in the time of can being convenient for follow-up operation, perhaps improves water efficiency.

Description

Circular flow clarifier system for water outlet on U-shaped pipe pool surface

Technical Field

The application relates to the technical field of sewage treatment, in particular to a circulating clarifier system for water outlet of a U-shaped pipe pool surface.

Background

With the development of industry and the improvement of living standard, people pay more and more attention to the problem of environmental pollution, and an overflow trough is usually arranged in a sewage treatment tank in the sewage treatment process, so that clean water on the upper layer in the sewage treatment tank overflows to the overflow trough and is discharged.

Since the supernatant is formed on the upper layer of the circulation clarifier, the existing process is to arrange a drain pipe to discharge the clarified liquid in the overflow tank, the drain pipe is usually arranged on the bottom of the overflow tank, and the supernatant flows into the drain pipe by the self-weight to realize the water discharge of the circulation clarifier, however, the drain pipe is completely immersed in the sewage, when the drain pipe has a fault, such as blockage or damage, the drain pipe needs to be manually submerged into the sewage for maintenance, so that safety risk exists, or the sewage is stopped to be treated and discharged to the fault position, and then the sewage enters the treatment tank for maintenance manually, so that manpower and material resources are consumed, and the maintenance difficulty is high.

SUMMERY OF THE UTILITY MODEL

The purpose of the application is to overcome the defects of the prior art and provide a circulation clarifier system with a simple structure and convenient maintenance for water outlet on the surface of a U-shaped pipe pool.

In order to achieve the technical purpose, the technical scheme adopted by the application is as follows:

the first is a circular flow clarifier system of U-shaped pipe pond face play water, includes:

the loop clarifier comprises a loop cavity and an overflow groove arranged at the top of the loop cavity;

a U-tube assembly comprising a U-tube having two communicating tube orifices, both of said orifices communicating with an overflow trough;

and the water flow control assembly comprises a water flow control part and a water conduit communicated with the water flow control part and one of the nozzles.

Specifically, the U-shaped pipe assembly comprises a first straight pipe, a second straight pipe and a U-shaped bottom pipe which is respectively communicated with the first straight pipe and the second straight pipe; the outward opening of the first straight pipe is a first pipe orifice, and the outward opening of the second straight pipe is a second pipe orifice.

Further, the water conduit of the water flow control assembly is inserted from the first nozzle or the second nozzle.

Preferably, a spiral water chute is arranged at the first pipe orifice or the second pipe orifice which is not inserted into the water conduit.

Optionally, the flow control member of the flow control assembly employs a water pump for pumping clear liquid inside the U-shaped tube assembly through the first or second nozzle using the water conduit.

Or, the water flow control part of the water flow control assembly adopts a siphon water outlet groove, one end of the water conduit is inserted into the first pipe orifice or the second pipe orifice to be close to the U-shaped bottom pipe, and the highest point of the water conduit extending to the siphon water outlet groove is higher than the overflow groove and is used for draining the clear liquid in the U-shaped pipe assembly through the first pipe orifice or the second pipe orifice by utilizing the water conduit.

Further preferably, the top surface of the circulation chamber is open; the overflow groove is erected in the top surface opening along the transverse direction or the longitudinal direction of the circular flow cavity; or the overflow groove is fixed in the top surface opening along the inner part of the side wall of the circular flow cavity.

Preferably, the bottom of the overflow groove is provided with drain holes corresponding to the two pipe orifices respectively, and the U-shaped pipe assembly is installed below the overflow groove.

Further, the air conditioner is provided with a fan,

the periphery of the drain hole is provided with a protruding or embedded clamping groove, and the U-shaped pipe assembly is provided with a clamping block matched with the clamping groove.

Optionally, the periphery of the drain hole is provided with a magnetic attraction positioning part, and the U-shaped pipe assembly is provided with a magnetic attraction part matched and corresponding to the magnetic attraction positioning part.

Compared with the prior art, the method has the following advantages:

(1) the utility model provides a circulation clarifier system of U-shaped pipe pond surface play water sets up the U-shaped pipe subassembly in the overflow launder below, and the water flow control subassembly is connected to rethread U-shaped pipe subassembly, conveniently reforms transform current circulation clarifier, also is convenient for subsequent use and maintenance.

(2) The utility model provides a U-shaped pipe pond face goes out circulation clarifier system of water, the U-shaped pipe subassembly can be dismantled with the overflow launder and be connected, carries out non-sealed formula with the rivers control assembly and is connected, makes things convenient for the dismouting, also easy to maintain.

(3) The utility model provides a circulation clarifier system of U-shaped pipe pool surface play water can use the water pump to carry out the drainage, can utilize the siphon principle to carry out unpowered drainage more optimally, also can go out the basin with water pump and siphon and combine together, carries out preliminary troubleshooting in the time of can being convenient for follow-up operation, perhaps improves water efficiency.

(4) The utility model provides a circulation clarifier system of U-shaped pipe pond face play water sets up spiral swift current hydrophone at the U-shaped pipe mouth of pipe, can avoid too much air to get into U-shaped pipe subassembly and rivers control assembly, avoids forming the bleb in rivers passageway, hinders the fluid to flow smoothly.

(5) According to the circulation clarifier system for water outlet of the U-shaped pipe pool surface, the mounting position of the overflow groove in the circulation clarifier can be flexibly adjusted, the limitation of the installation of the U-shaped pipe assembly is hardly caused, and the water outlet efficiency of the circulation clarifier can be improved.

Drawings

FIG. 1 is a schematic diagram of the present application of a U-tube pond surface effluent loop clarifier system.

FIG. 2 is a schematic illustration of the installation of the U-tube assembly in the U-tube pond face effluent circulator clarifier system of the present application.

FIG. 3 is a schematic illustration of a first embodiment of an overflow trough in the U-tube pond face effluent loop clarifier system of the present application.

Fig. 4 is a schematic diagram of a second embodiment of an overflow trough in the present U-tube pond surface effluent loop clarifier system.

FIG. 5 is a schematic diagram of a third embodiment of an overflow trough in the U-tube pond face effluent loop clarifier system of the present application.

Detailed Description

The present application is described in further detail below with reference to the attached drawings and the detailed description.

Referring to fig. 1, the present application is directed to a U-tube pond surface effluent clarifier system comprising a clarifier 1, a U-tube assembly 2, and a flow control assembly 3. The U-shaped pipe assembly 2 is connected with the circulation clarifier 1 and the water flow control assembly 3, and the effect of water outlet of the pool surface of the circulation clarifier 1 is achieved.

Specifically, the loop clarifier 1 comprises a loop cavity 11 and an overflow chute 12 arranged at the top of the loop cavity 11, and the working principle of the loop clarifier 1 is as follows: the sewage treatment equipment is internally provided with a biochemical reaction sedimentation tank, an aeration system is arranged in the biochemical reaction sedimentation tank, on one hand, the aeration system fully mixes sewage and sludge containing microorganisms, on the other hand, power for enabling a sludge-water mixture to flow upwards is provided, the top of the biochemical reaction sedimentation tank is provided with the circulation clarifier 1, the sludge-water mixture and nitrifying liquid after biochemical reaction flow into the circulation clarifier 1 under the action of the aeration system, three-phase separation is realized after flow guiding and flow dividing in the circulation clarifier 1, the sludge with higher density enters the biochemical reaction sedimentation tank again to be involved in sewage purification, the clarifying liquid with lower density is discharged out of the biochemical reaction sedimentation tank through the overflow groove 12, and redundant gas is discharged out of the biochemical reaction sedimentation tank through the top opening 111 of the circulation clarifier 1. The overflow tank 12 is preferably arranged in the top opening 111 of the circulation chamber 11 and not higher than the top surface of the circulation chamber 11, and the level 4 of the clarified liquid is slightly higher than the height of the overflow tank 12 when the clarified liquid overflows into the overflow tank 12. The internal diversion and flow distribution structure of the circulation cavity 11 can be reasonably designed and adjusted on the basis that the three-phase separation principle is known by the technical personnel in the field, and the process of discharging the clarified liquid through the overflow chute 12 is not influenced.

The U-shaped tube assembly 2, as shown in fig. 1 and fig. 2, includes a first straight tube 21, a second straight tube 22, and a U-shaped bottom tube 23 respectively communicating with the first straight tube 21 and the second straight tube 22, for convenience of processing, the first straight tube 21 and the second straight tube 22 may be processed by using tubes of the same material and the same specification, and the tube openings of the U-shaped bottom tube 23 should also be respectively adapted to the first straight tube 21 and the second straight tube 22 to avoid the occurrence of the phenomenon of leakage of the pipeline; the outward opening of the first straight pipe 21 is a first pipe orifice 24, the outward opening of the second straight pipe 22 is a second pipe orifice 25, and the first pipe orifice 24 and the second pipe orifice 25 are communicated with each other.

Further, the first pipe orifice 24 and the second pipe orifice 25 are both communicated with the overflow trough 12, specifically, two drainage holes 122 are opened at the bottom 121 of the overflow trough 12 for respectively corresponding to the first pipe orifice 24 and the second pipe orifice 25, and the U-shaped pipe assembly 2 is installed below the overflow trough 12. Preferably, the internal diameter of the drain holes 122 is not greater than the internal diameter of the first and second nozzles 25, so that the supernatant automatically flows from the overflow trough 12 into the hairpin tube assembly 2 without leaking at the pipe connections. Preferably, the hairpin tube assembly 2 is removably mounted below the isopipe 12 to facilitate retrofitting of an existing loop clarifier 1 or to facilitate repair or replacement of the hairpin tube assembly 2.

In an alternative embodiment, the periphery of the water discharge hole 122 is provided with a protruding or embedded slot (not shown), and the U-shaped tube assembly 2 is provided with a latch (not shown) which is matched with the slot. The periphery of the drainage hole 122 can be understood as the groove bottom 121 of the overflow groove 12 where the drainage hole 122 is located, or the sidewall 112 of the circulation chamber 11 adjacent to the drainage hole 122. A clamping groove with a protruding surface or an embedded surface is arranged on the groove bottom 121 of the overflow groove 12 or the side wall 112 of the circulation cavity 11, and correspondingly, a clamping block is arranged on the surface of the U-shaped tube assembly 2, so that the U-shaped tube assembly 2 is hung below the overflow groove 12. The clamping block is arranged on a convex positioning structure of the U-shaped pipe assembly 2, such as a flange of the first pipe orifice 24 or the second pipe orifice 25, or a positioning block additionally arranged on the surface of the first straight pipe 21 or the second straight pipe 22. In one possible embodiment, the clamping groove is a circular through hole formed in the side wall 112 of the circulation chamber 11, the clamping block is a buckle which is arranged on the surface of the U-shaped tube assembly 2 and has an inverted V shape, a longitudinal compression groove is formed in the middle of the buckle, the maximum transverse dimension of the buckle surface is larger than the inner diameter of the circular through hole under the condition of no external force, but the maximum transverse dimension after the compression groove is smaller than the inner diameter of the circular through hole; through the adjustment of the compression groove of the buckle, the buckle is detachably inserted into the circular through hole, so that the U-shaped pipe assembly 2 can be detachably installed in the circulation clarifier 1. In another possible embodiment, the locking groove is protrudingly arranged at the groove bottom 121 of the overflow groove 12, the locking block is a flange of the first pipe orifice 24 or the second pipe orifice 25, and the U-shaped pipe assembly 2 can be inserted into the locking groove along the transverse direction or the longitudinal direction of the overflow groove 12 to be detachably mounted with the overflow groove 12.

Another optional implementation manner of the detachable connection between the U-shaped tube assembly and the overflow chute is that a magnetic attraction positioning piece (not shown) is arranged at the periphery of the water discharge hole 122, and the U-shaped tube assembly 2 is provided with a magnetic attraction piece corresponding to the magnetic attraction positioning piece in a matching manner. Magnetism inhale the formula mounting means that formula mounting means is inhaled with magnetism of inhaling of piece has the risk that drops after the installation because magnetic material's restriction exists, consequently magnetism is inhaled the formula installation and can be considered as the auxiliary positioning means of two kinds of demountable installation modes above, and an alternative implementation is wash port 122 periphery sets up positioning magnet, utilizes the metal preparation that has magnetism nature U-shaped pipe subassembly 2's ring flange, works as U-shaped pipe subassembly 2 is close to during the wash port 122, U-shaped pipe subassembly 2 easily is fixed by magnet absorption. The magnetic positioning element and the magnetic element may also be disposed between the side wall 112 of the circulation chamber 11 and the U-shaped tube assembly 2, so as to detachably mount the U-shaped tube assembly 2 on the side wall 112 of the circulation chamber 11. Further, if the improvement of magnetic material can greatly reduce the risk that the U-shaped pipe assembly 2 drops after being fixed, it is also according with the principle essence of this application to only carry out demountable installation with the formula installation of magnetism.

The water flow control assembly 3 comprises a water flow control member 31 and a water conduit 32 communicating the water flow control member 31 and the first nozzle 24 or the second nozzle 25. With continued reference to fig. 1, the hairpin tube assembly 2 is shown mounted adjacent to one of the side walls 112 of the annular flow chamber 11, and for ease of operation, the water conduit 32 is inserted at one end into the second straight tube 22 through the second nozzle 25 closer to the side wall 112, and at the other end into a siphon exit channel outside the annular flow clarifier 1, wherein the first nozzle 24 is in direct communication with the overflow launder 12, and the second nozzle 25 is in non-sealing communication with the water conduit 32, and the second nozzle 25 is also in communication with the overflow launder 12. The water conduit 32 should be as deep as possible into the second straight pipe 22 and close to the U-shaped bottom pipe 23. The siphon spout drains the clarified liquid flowing into the U-tube assembly 2 out of the loop clarifier 1 based on the siphon principle, and is therefore intended to act as a flow control member 31. Further, the highest liquid level 5 of the water tank in the siphon water outlet tank does not exceed the liquid level 4 of the clarified liquid in the circulation clarifier 1, and the lowest liquid level 6 of the water tank is not lower than the top horizontal line of the U-shaped bottom pipe 23.

When the clarified liquid in the overflow trough 12 sequentially fills the first pipe orifice 24 (simultaneously flows into the second pipe orifice 25), the first straight pipe 21 (simultaneously flows into the second straight pipe 22), the U-shaped bottom pipe 23, and the water conduit 32 to the siphon water outlet trough, the clarified liquid continuously flowing into the overflow trough 12 can be continuously discharged to the siphon water outlet trough based on the siphon principle. When the liquid level in the first straight pipe 21 (including the second straight pipe 22) is lowered to be equal to the liquid level in the siphon water outlet tank, the clear liquid in the pipe does not flow towards the siphon water outlet tank any more because the air pressure difference between the liquid levels at the two positions is zero, and the drainage process is suspended. When the liquid level in the first straight pipe 21 rises again, the liquid levels at the two ends of the U-shaped pipe assembly 2 generate air pressure difference again, and the drainage process continues.

In order to ensure continuous drainage, namely to ensure that the siphon principle is continuously effective, the highest point 321 of the water conduit 32 must be higher than the liquid level 4 of the clarified liquid, and the water conduit 32 can be any one of a hose, a hard plastic pipe and a steel pipe, or even a combination of pipes made of different materials; further, a water pump is arranged on the water conduit 32 so as to discharge air in the water conduit 32 for starting the siphon drainage process and timely discharging air in the water flow pipeline to maintain the siphon drainage process; when necessary, the water pump can also work continuously to improve drainage efficiency.

Further, a spiral hydro-chute (not shown) may be provided at the first nozzle 24 of the U-shaped tube assembly 2. The spiral water scraper-trough conveyer comprises a central column and spiral blades, wherein the spiral blades are arranged on the central column so as to enable liquid to flow along a spiral flow guide path formed by the spiral blades. The central column can be designed into a solid or hollow conduit column, the helical blade is a helical ladder shape formed by extending around the periphery of the central column along the axial direction of the central column, when the clarified liquid of the overflow chute 12 flows into the first pipe orifice 24, the clarified liquid can flow into the U-shaped pipe assembly 2 along the helical flow guide path formed by the helical blade, and the air can be discharged along the track opposite to the flow direction of the clarified liquid, so that the air bubbles cannot be formed in the U-shaped pipe assembly 2 to reduce the water outlet effect, and particularly the air bubbles cannot be accumulated at the highest point 321 of the water conduit 32, so that the siphon effect is disabled.

Further, the placement of the overflow launder 12 also affects the drainage effectiveness of the present U-tube pond surface effluent clarifier system. Referring to fig. 3-5, typically, a trough is plumbed along the longitudinal axis of the circulation chamber 11 within the top opening 111 to form a longitudinal overflow trough 12b, so that clarified liquor can overflow into the trough 12 from both sides; alternatively, a plurality of the transverse overflow grooves 12a may be provided and arranged evenly in the top opening 111 of the circulation chamber 11 in order to increase the overflow water yield, the transverse overflow grooves 12a being erected in the top opening 111 in the transverse direction of the circulation chamber 11 to form the transverse overflow grooves 12a, the capacity of the single transverse overflow groove 12a being smaller than that of the single longitudinal overflow groove 12 b; in another case, the overflow launder 12 is fixed inside the top opening 111 along the side wall 112 of the circulation chamber 11, and at this time, the clear liquid overflows from one side of the overflow launder 12 and enters, and in order to increase the overflow water yield, a pair of transverse overflow launders 12a or a pair of longitudinal overflow launders 12b may be provided along the side wall 112 of the circulation chamber 11, or a transverse overflow launder 12a and a longitudinal overflow launder 12b may be provided at the same time, and preferably, the transverse overflow launder 12a and the longitudinal overflow launder 12b which are connected to each other are communicated with each other. The U-shaped pipe assembly 2 disposed below the overflow tanks 12 (including the transverse overflow tanks 12a and the longitudinal overflow tanks 12b) is preferably disposed close to the side wall 112 of the circulating cavity 11, so that the U-shaped pipe assembly 2 can be conveniently fixed on the side wall 112 to be detachably mounted, and centralized drainage can be performed, if the overflow tanks 12 in the same circulating cavity 11 are not communicated with each other, one U-shaped pipe assembly 2 is required to be disposed for each overflow tank 12, and if a plurality of overflow tanks 12 in the same circulating cavity 11 are communicated with each other, one U-shaped pipe assembly 2 is disposed. Further, the overflow launder 12 is provided with a drainage slope at the position where the hairpin tube assembly 2 is installed to promote the flow of clarified liquid into the hairpin tube assembly 2. The installation mode of the overflow groove 12 can be set according to the load capacity of the loop clarifier 1 and the biochemical reaction process requirements, and the installation position of the overflow groove 12 in the loop cavity 11 does not depart from the principle essence of the application.

Further, the application also provides a water outlet method of the circulating clarifier:

(1) the clarified liquor inside the loop clarifier 1 is driven to overflow into an overflow launder 12.

The circulation clarifier 1 is arranged at the top of the biological reaction sedimentation tank, the bottom of the biological reaction sedimentation tank is provided with an aeration system, the aeration system drives the mud-water mixture at the bottom of the biological reaction sedimentation tank to enter the circulation clarifier 1 so as to realize three-phase separation in the circulation clarifier 1, and the clarified liquid with lower density overflows into an overflow groove 12 at the top of the circulation clarifier 1.

(2) The clear liquid in the overflow groove 12 automatically fills the U-shaped pipe assembly 2 communicated with the two pipe orifices below the overflow groove 12.

Since the U-shaped pipe assembly 2 is disposed below the overflow trough 12, and both pipe openings of the U-shaped pipe assembly 2 are communicated with the overflow trough 12, after the supernatant liquid overflows into the overflow trough 12, the supernatant liquid flows into the U-shaped pipe assembly 2 along the overflow trough 12, and the U-shaped pipe assembly 2 is filled.

(3) And (3) pumping the clarified liquid in one of the pipe orifices in the U-shaped pipe assembly 2, so that the clarified liquid in the overflow chute 12 flows out of the circulation clarifier 1 from the pipe orifice, and the water outlet of the pond surface of the circulation clarifier 1 is realized.

The U-tube assembly 2 serves to facilitate the creation of a liquid level difference between the interior and the exterior of the loop clarifier 1, so that unpowered drainage can be achieved using the siphon principle. The apparatus for effecting siphonic drainage further comprises a flow control assembly 3, said flow control assembly 3 comprising a flow control member 31 and an inlet conduit 32. If the water is drained based on the siphon principle, the water flow control member 31 selects a siphon water outlet groove and further comprises a water pump if necessary.

When the U-shaped pipe assembly 2 is filled with the clear liquid, the clear liquid in the U-shaped pipe assembly 2 keeps static and does not flow because the liquid levels near the two pipe orifices of the U-shaped pipe assembly 2 are equal in height and the air pressure difference is zero; after one of the nozzles is inserted into the water conduit 32, since the water conduit 32 is in non-sealed communication with the nozzle, the liquid level in the water conduit 32 and the liquid level in the other nozzle are kept at the same height due to the air pressure difference being zero under the condition that one end of the water conduit 32 is inserted into the U-shaped pipe assembly 2 and the other end is free and unconnected; after the air in the conduit 32 is drawn out of the free end, the air pressure in the conduit 32 is reduced, and the liquid in the conduit is squeezed from the side with high air pressure to the side with low air pressure by the atmospheric pressure, so that the liquid in the conduit is pushed to flow to the free end of the conduit 32.

Because the U-shaped pipe assembly 2 is communicated with the overflow trough 12, after the clarified liquid filled in the U-shaped pipe assembly 2 enters the water conduit 32 and is discharged out of the water conduit 32 to leave the circulating clarifier 1, the clarified liquid flowing in from the overflow trough 12 is continuously supplemented, so the clarified liquid which is subsequently supplemented and flows into the U-shaped pipe assembly 2 also continuously flows out from the free end of the water conduit 32, and the continuous drainage process is realized.

In the above process, if the air in the water conduit 32 is pumped out by the water pump, the air flow power provided by the water pump can be removed after the clear liquid flows out of the water conduit 32, and the water is continuously drained by the siphon principle, but it should be noted that the liquid level in the siphon water outlet tank for receiving the drained water cannot exceed the clear liquid level 4 in the circumfluence clarifier 1 at the highest level and is not lower than the top horizontal line of the U-shaped bottom pipe 23 in the U-shaped pipe assembly 2 at the lowest level, and meanwhile, the highest point 321 of the water conduit 32 must be higher than the clear liquid level 4 to keep the siphon effect effective. If the water is drained without depending on the siphon principle, the water pump can be continuously operated.

To sum up, this application U-shaped pipe pond surface goes out circulation clarifier system of water sets up the U-shaped pipe subassembly in the overflow launder below, and the water flow control subassembly is connected to rethread U-shaped pipe subassembly, conveniently reforms transform current circulation clarifier, also is convenient for subsequent use and maintenance. This application can use the water pump to carry out the drainage, can utilize the siphon principle to carry out unpowered drainage more optimally, also can go out the basin with water pump and siphon and combine together, carries out preliminary troubleshooting in the time of can being convenient for follow-up operation, perhaps improves water efficiency.

The above embodiments are only preferred embodiments of the present application, but not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present application should be construed as equivalents and are included in the scope of the present application.

Claims

1. A loop clarifier system for U-tube pond surface effluent, comprising:

2. The system of claim 1, wherein the U-tube assembly comprises a first straight tube, a second straight tube, and a U-bottom tube in communication with the first and second straight tubes, respectively; the outward opening of the first straight pipe is a first pipe orifice, and the outward opening of the second straight pipe is a second pipe orifice.

3. The system of claim 2, wherein the penstock of the flow control assembly is inserted from the first nozzle or the second nozzle.

4. The system as claimed in claim 3, wherein a spiral water chute is provided at the first nozzle or the second nozzle which is not inserted into the water conduit.

5. The system of claim 3, wherein the flow control of the flow control assembly employs a water pump for pumping clarified liquid from within the U-tube assembly through the first or second nozzle using the penstock.

6. The system of claim 3, wherein the flow control member of the flow control assembly employs a siphon exit trough, the penstock having one end inserted into the first or second nozzle proximate the U-shaped bottom tube, the penstock extending to the siphon exit trough a higher elevation than the overflow trough for draining supernatant liquid from the U-shaped tube assembly through the first or second nozzle using the penstock.

7. The system of claim 1, wherein the annular flow chamber is open at a top surface; the overflow groove is erected in the top surface opening along the transverse direction or the longitudinal direction of the circular flow cavity; or the overflow groove is fixed in the top surface opening along the inner part of the side wall of the circular flow cavity.

8. The system of claim 1, wherein said overflow trough has a bottom opening defining drainage holes corresponding to said two pipe openings, respectively, and said U-shaped pipe assembly is mounted below said overflow trough.

9. The system as claimed in claim 8, wherein the drain hole is provided at the periphery thereof with a protruding or embedded slot, and the U-shaped pipe assembly is provided with a latch fitting with the slot.

10. The system of claim 9, wherein the drain hole is provided with a magnetic attraction positioning member at the periphery thereof, and the U-shaped pipe assembly is provided with a magnetic attraction member matching and corresponding to the magnetic attraction positioning member.